pack-objects: split add_object_entry

This function actually does three things:

  1. Check whether we've already added the object to our
     packing list.

  2. Check whether the object meets our criteria for adding.

  3. Actually add the object to our packing list.

It's a little hard to see these three phases, because they
happen linearly in the rather long function. Instead, this
patch breaks them up into three separate helper functions.

The result is a little easier to follow, though it
unfortunately suffers from some optimization
interdependencies between the stages (e.g., during step 3 we
use the packing list index from step 1 and the packfile
information from step 2).

More importantly, though, the various parts can be
composed differently, as they will be in the next patch.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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